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課程

/數(shù)據(jù)庫

/MySQL

/與MySQL的零距離接觸

CREATE?TABLE?users1?(id?SMALLINT?UNSIGNED?PRIMARY?KEY?AUTO_INCREMENT,?username?VARCHAR(10)?NOT?NULL,?pid?SMALLINT?UNSIGNED,?FOREIGN?KEY?(pid)?REFERENCES?provinces?(id)?ON?DELETE?CASCADE?ON?UPDATE?CASCADE);